ReactOS  0.4.14-dev-317-g96040ec
varray.cc
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1 /*
2 ** License Applicability. Except to the extent portions of this file are
3 ** made subject to an alternative license as permitted in the SGI Free
4 ** Software License B, Version 1.1 (the "License"), the contents of this
5 ** file are subject only to the provisions of the License. You may not use
6 ** this file except in compliance with the License. You may obtain a copy
7 ** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
8 ** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
9 **
10 ** http://oss.sgi.com/projects/FreeB
11 **
12 ** Note that, as provided in the License, the Software is distributed on an
13 ** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
14 ** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
15 ** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
16 ** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
17 **
18 ** Original Code. The Original Code is: OpenGL Sample Implementation,
19 ** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
20 ** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
21 ** Copyright in any portions created by third parties is as indicated
22 ** elsewhere herein. All Rights Reserved.
23 **
24 ** Additional Notice Provisions: The application programming interfaces
25 ** established by SGI in conjunction with the Original Code are The
26 ** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
27 ** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
28 ** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
29 ** Window System(R) (Version 1.3), released October 19, 1998. This software
30 ** was created using the OpenGL(R) version 1.2.1 Sample Implementation
31 ** published by SGI, but has not been independently verified as being
32 ** compliant with the OpenGL(R) version 1.2.1 Specification.
33 */
34 
35 /*
36  * varray.c++
37  *
38  */
39 
40 //#include "glimports.h"
41 //#include "myassert.h"
42 //#include "mystdio.h"
43 #include "varray.h"
44 #include "arc.h"
45 #include "simplemath.h" // glu_abs()
46 
47 #define TINY 0.0001
48 inline long sgn( REAL x )
49 {
50  return (x < -TINY) ? -1 : ((x > TINY) ? 1 : 0 );
51 }
52 
53 
55 {
56  int i;
57 
58  varray = 0;
59  size = 0;
60  numquads = 0;
61 
62  for (i = 0; i < 1000; i++) {
63  vval[i] = 0;
64  voffset[i] = 0;
65  }
66 }
67 
69 {
70  if( varray ) delete[] varray;
71 }
72 
73 inline void
74 Varray::update( Arc_ptr arc, long dir[2], REAL val )
75 {
76  register long ds = sgn(arc->tail()[0] - arc->prev->tail()[0]);
77  register long dt = sgn(arc->tail()[1] - arc->prev->tail()[1]);
78 
79  if( dir[0] != ds || dir[1] != dt ) {
80  dir[0] = ds;
81  dir[1] = dt;
82  append( val );
83  }
84 }
85 
86 void
87 Varray::grow( long guess )
88 {
89  if( size < guess ) {
90  size = guess * 2;
91  if( varray ) delete[] varray;
92  varray = new REAL[size];
93  assert( varray != 0 );
94  }
95 }
96 
97 long
98 Varray::init( REAL delta, Arc_ptr toparc, Arc_ptr botarc )
99 {
100  Arc_ptr left = toparc->next;
101  Arc_ptr right = toparc;
102  long ldir[2], rdir[2];
103 
104  ldir[0] = sgn( left->tail()[0] - left->prev->tail()[0] );
105  ldir[1] = sgn( left->tail()[1] - left->prev->tail()[1] );
106  rdir[0] = sgn( right->tail()[0] - right->prev->tail()[0] );
107  rdir[1] = sgn( right->tail()[1] - right->prev->tail()[1] );
108 
109  vval[0] = toparc->tail()[1];
110  numquads = 0;
111 
112  while( 1 ) {
113  switch( sgn( left->tail()[1] - right->prev->tail()[1] ) ) {
114  case 1:
115  left = left->next;
116  update( left, ldir, left->prev->tail()[1] );
117  break;
118  case -1:
119  right = right->prev;
120  update( right, rdir, right->tail()[1] );
121  break;
122  case 0:
123  if( glu_abs(left->tail()[1] - botarc->tail()[1]) < TINY) goto end;
124  if( glu_abs(left->tail()[0]-right->prev->tail()[0]) < TINY &&
125  glu_abs(left->tail()[1]-right->prev->tail()[1]) < TINY) goto end;
126  left = left->next;
127  break;
128  }
129  }
130 
131 end:
132  append( botarc->tail()[1] );
133 
134  grow( ((long) ((vval[0] - vval[numquads])/delta)) + numquads + 2 );
135 
136  long i, index = 0;
137  for( i=0; i<numquads; i++ ) {
138  voffset[i] = index;
139  varray[index++] = vval[i];
140  REAL dist = vval[i] - vval[i+1];
141  if( dist > delta ) {
142  long steps = ((long) (dist/delta)) +1;
143  float deltav = - dist / (REAL) steps;
144  for( long j=1; j<steps; j++ )
145  varray[index++] = vval[i] + j * deltav;
146  }
147  }
148  voffset[i] = index;
149  varray[index] = vval[i];
150  return index;
151 }
152 
long numquads
Definition: varray.h:51
long sgn(REAL x)
Definition: varray.cc:48
REAL glu_abs(REAL x)
Definition: simplemath.h:50
#define ds
Definition: i386-dis.c:434
#define assert(x)
Definition: debug.h:53
GLint GLint GLint GLint GLint x
Definition: gl.h:1548
GLuint GLuint end
Definition: gl.h:1545
~Varray()
Definition: varray.cc:68
GLsizei GLenum const GLvoid GLsizei GLenum GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLint GLint GLint GLshort GLshort GLshort GLubyte GLubyte GLubyte GLuint GLuint GLuint GLushort GLushort GLushort GLbyte GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLfloat GLint GLint GLint GLint GLshort GLshort GLshort GLshort GLubyte GLubyte GLubyte GLubyte GLuint GLuint GLuint GLuint GLushort GLushort GLushort GLushort GLboolean const GLdouble const GLfloat const GLint const GLshort const GLbyte const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLdouble const GLfloat const GLfloat const GLint const GLint const GLshort const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort GLenum GLenum GLenum GLfloat GLenum GLint GLenum GLenum GLenum GLfloat GLenum GLenum GLint GLenum GLfloat GLenum GLint GLint GLushort GLenum GLenum GLfloat GLenum GLenum GLint GLfloat const GLubyte GLenum GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLint GLint GLsizei GLsizei GLint GLenum GLenum const GLvoid GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLenum const GLdouble GLenum GLenum const GLfloat GLenum GLenum const GLint GLsizei GLuint GLfloat GLuint GLbitfield GLfloat GLint GLuint GLboolean GLenum GLfloat GLenum GLbitfield GLenum GLfloat GLfloat GLint GLint const GLfloat GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat const GLdouble const GLfloat const GLdouble const GLfloat GLint i
Definition: glfuncs.h:248
REAL vval[1000]
Definition: varray.h:49
static DWORD DWORD DWORD DWORD * steps
Definition: cursoricon.c:1521
GLuint index
Definition: glext.h:6031
unsigned int dir
Definition: maze.c:112
void grow(long)
Definition: varray.cc:87
GLuint GLfloat * val
Definition: glext.h:7180
GLsizei GLenum const GLvoid GLsizei GLenum GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLint GLint GLint GLshort GLshort GLshort GLubyte GLubyte GLubyte GLuint GLuint GLuint GLushort GLushort GLushort GLbyte GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLfloat GLint GLint GLint GLint GLshort GLshort GLshort GLshort GLubyte GLubyte GLubyte GLubyte GLuint GLuint GLuint GLuint GLushort GLushort GLushort GLushort GLboolean const GLdouble const GLfloat const GLint const GLshort const GLbyte const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLdouble const GLfloat const GLfloat const GLint const GLint const GLshort const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort GLenum GLenum GLenum GLfloat GLenum GLint GLenum GLenum GLenum GLfloat GLenum GLenum GLint GLenum GLfloat GLenum GLint GLint GLushort GLenum GLenum GLfloat GLenum GLenum GLint GLfloat const GLubyte GLenum GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLint GLint GLsizei GLsizei GLint GLenum GLenum const GLvoid GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLenum const GLdouble GLenum GLenum const GLfloat GLenum GLenum const GLint GLsizei GLuint GLfloat GLuint GLbitfield GLfloat GLint GLuint GLboolean GLenum GLfloat GLenum GLbitfield GLenum GLfloat GLfloat GLint GLint const GLfloat GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat const GLdouble const GLfloat const GLdouble const GLfloat GLint GLint GLint j
Definition: glfuncs.h:250
GLsizeiptr size
Definition: glext.h:5919
long size
Definition: varray.h:54
GLint left
Definition: glext.h:7726
GLdouble GLdouble right
Definition: glext.h:10859
#define index(s, c)
Definition: various.h:29
long init(REAL, Arc *, Arc *)
Definition: varray.cc:98
class Arc * Arc_ptr
Definition: arc.h:50
#define long
Definition: qsort.c:33
#define TINY
Definition: varray.cc:47
void update(Arc *, long[2], REAL)
Definition: varray.cc:74
void append(REAL)
Definition: varray.h:61
float REAL
Definition: types.h:41
long voffset[1000]
Definition: varray.h:50
Varray()
Definition: varray.cc:54
REAL * varray
Definition: varray.h:48